Closing a lane can be useful to carry on an attack, it is also called interference ( fr: interception), as the goal is to intercept the defence. Opening a column/diagonal is a common motif where the attack gains intensity.
Let's look at one example of each kind.
Closing lines: White to play
Miles-Pritchett 1982
1.?
Miles played the fantastic 1.Be5!!
This moves covers b2 (X-Ray), while interfering with black defensive pieces. 1..R8e5 or 1..R2e5 lets 2Qg7#,
while 1..Be5 breaks the coordination between rooks : 2.Qe8 follows. In chess composition, this theme is called a Novotny.
Black resigned after 1.Be5!!
Opening lines: Alekhine-Borochov 1932
White to play and win
Alekhine played 1.Ne6!. While this moves closes the c8-h3 diagonal temporarily( interference again!), it also opens the g-column.
After 1..Be6, the genius ahead of his time played 2Qh7+!!, where 2..Kh7 3Rh3+ wins with check-mate following.
A great example of both concepts !
Exercise: White to play and win
Larsen-Matanovic, 1965
2 comments:
1.Nf6+ seems to be the answer;
1..gxf6; 2.Qxh6, Rxc4; 3.Nf5!, Rc2+
4.Kh3, Bf6 (or 4..Bf8 is met by
5.Ne7+!, Bxe7; 6.Qg7#)
5.Ne7+!, Kh8; 6.Bxf6+, Nxf6; 7.Qg7#
if instead black plays:
1..Kh8; 2.Ndf5!, Bf6; 3.Bxf6, Nxf6;
4. Rxc8+, Qxc8; 5.Nxf7+ followed by 6. Ne7+ and black loses its queen. If at 2.Ndf5! black replies with exf5 then white has a double-attack with 3. Qc3!, while if instead black plays 2.. Nf6 then white continuation is 3.Rxc8+,Qxc8; 4.Nxf7+, Kg8; 5.Nxe7+ and black also loses its queen.
There are many possible responses of black that I havent analyzed yet: what if black plays 1..Kf8 or what if in the first variation black plays 2..Bf6; so, sorry but I cannot a suitable continuation for white.
I think you meant 1.Nh6+ ( as opposed to the typo 1 Nf6+ which is countered by 1..Bf5) in your variations.
1 Nh6+ gh6 2 Qh6 e5!? 3 Nf5 Bf8
or 3 Ne6 fe6 4 Be5 Nf6 with 2 pawns against the Knight for White.
also 1 Nh6+ gh6 2Ne6!? fe6 3 Qc3 Bf6 4 Rc8+ Kf7 is unclear.
Finally on 2..Bf6 White could try 3Nf5!? ef5 4 Bf6 Nf6 5 Qg5+ Kf8 6 Qf6 with again 2 pawns against Knight for White.
You find all the tactical themes underlying in the position. Now it's a question of move order!!
Check out this norwegian site if you want to play through the game !
http://www.tromsosjakklubb.com/ukens01/46losn.htm
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